| Abbreviation | Definition |
|---|---|
| HASA | Hawaii Amateur Surfing Association |
| HASA | Home and School Association |
| HASA | Houston Association of School Administrators |
| HASA | Hudson Area Swim Association |
| HASI | Hubbard Association of Scientologists International |
| HASK | Houston Association of Sea Kayakers |
| HASP | Hawaii Association of School Psychologists |
| HASTA | Hayward Area Ski Trail Association |
| HASWA | Havering Asian Social and Welfare Association |
| HATC | Hotel Association of Tarrant County |
| HATS | Huntsville Association of Technical Societies |
| HATTA | Hellenic Association of Travel and Tourist Agents |
| HAVA | Harbor Association of Volunteers for Animals |
| HAVA | Houston Association of Volunteer Administrators |
| HAVOC | Hamilton Association for Volunteering Outreach and Charity |
| HAVS | Hillingdon Association of Voluntary Services |
| HAWA | Hardware Association of Western Australia |
| HAWA | Haywood Animal Welfare Association |
| HAWA | Huntsville Alabama Witches Association |
| HAZE | Hangtown Association of Zymurgy Enthusiasts |